John Martin Reservoir

Bent County, CO

MAYBEConfidence · Low
Best bite window
The highlighted window has passed. This read is still based on the latest cached weather; use the 7-Day forecast below for the next window.
Main reason
dry conditions across the window
Main risk
a front passing through

MAYBE on John Martin Reservoir — light winds and rising pressure after a passing system for this window. Watch a front passing through. Weather-only read (no on-water history calibrating this yet).

Next forecast window
MAYBE

Fri · Sep 11, 4 AM → 8 AM (America/Denver)

Full read

The latest cached fishing-weather read for John Martin Reservoir in Bent County, CO is MAYBE. Its highlighted window has passed, so use the 7-day forecast below for the next available window. The main factor in its favor was dry conditions across the window, while the main watch-out was a front passing through. Its cached forecast evidence included wind near 4 mph out of the southeast, gusting to 9 mph; surface pressure near 884 hPa on a rising trend; 0.00 inches of rain; and air temperature near 70 °F with mostly clear dominant. Confidence in this cached read is low; it was generated September 10, 2026, 1:00 PM UTC, and reads refresh on a daily cadence. This is a weather-only read built from forecast weather; it does not yet use on-water reports, and confidence is capped until local water data or feedback exists.

UPDATED September 10, 2026, 1:00 PM UTCBUCKET 2026-09-10ENGINE 0.7.0

Conditions at a glance

Wind
4mph

SE · gust 9

Rain / Weather
0in

Mostly clear

Temp
70°F

21°C · hum 79%

Pressure
26.10inHg

Rising

7-Day Fishing Forecast

One read per day — the bite call, the window, the weather behind it

  1. Thu · Sep 10
    Window passed
    MAYBE
    A front passing through
    82° / 63°F
    4 mph · SEgust 17
    0.00 in
    ↓ -4.9 hPa
  2. Fri · Sep 11
    4 AM → 8 AM
    MAYBE
    A front passing through
    95° / 63°F
    6 mph · Egust 13
    0.00 in
    ↓ -5.3 hPa
  3. Sat · Sep 12
    5 AM → 9 AM
    MAYBE
    A front passing through
    91° / 72°F
    5 mph · NWgust 27
    0.00 in
    ↓ +3.5 hPa
  4. Sun · Sep 13
    4 AM → 8 AM
    MAYBE
    A front passing through
    97° / 68°F
    5 mph · NWgust 43
    0.00 in
    ↓ -3.5 hPa
  5. Mon · Sep 14
    4 AM → 8 AM
    MAYBE
    A front passing through
    91° / 66°F
    7 mph · SWgust 34
    0.00 in
    ↑ +8.7 hPa
  6. Tue · Sep 15
    8 AM → 12 PM
    MAYBE
    A front passing through
    72° / 63°F
    7 mph · NEgust 21
    0.35 in
    ↑ +4.8 hPa
  7. Wed · Sep 16
    5 AM → 9 AM
    MAYBE
    A front passing through
    81° / 63°F
    6 mph · Egust 25
    0.68 in
    → +5.6 hPa

Last 3 days

Recent context — what just happened

Pressure
Rising
+8.6 hPa over 72h
Rain
Dry stretch
0.03 in totallast 72h
Wind
Gusty
9 mph · gust 34 · NE
Temperature
Cooler
-5.0°F over 72h102–64°F range

Weather-only read. Confidence is capped until local water data or feedback exists.

About John Martin Reservoir

John Martin Reservoir, in Bent County, CO, is Sometimes called a sapphire on the plains.

Elevation
3,851.87 ft
Managing agency
U.S. Army Corps of Engineers (owns/operates dam and reservoir); recreation managed by Colorado Parks and Wildlife under lease
Dam
John Martin Dam (Arkansas River)

Primary species: White bass, Hybrid striped bass, Black crappie, Saugeye, Walleye, Largemouth bass, Channel catfish, Freshwater drum, Flathead catfish, Blue catfish, Smallmouth bass, Bluegill.

Nearby waters

Weather data by Open-Meteo — CC BY 4.0. Fishing Weather derives the fishing read.